Fig. 4

OCT scans in a case of acute severe CRAO: Fig. 4A: The right eye OCT scan in a case of acute CRAO at 2-day interval from the onset of visual symptoms shows the opacification and thickening of the inner retinal layers and loss of individual inner retinal layer stratification. These OCT features are suggestive of a severe variety of acute CRAO. Fig. 4B: OCT scan done on the following day shows the separation of the internal limiting membrane (ILM) from the underlying nerve fibre layer with multiple hyperreflective posterior dots suggestive of internal limiting membrane detachment. There is still inner retinal layer opacification, thickening and loss of retinal layer stratification. The normal foveal contour is lost. Fig. 4C: On day 13, post presentation of symptoms, the OCT scan shows reduction in inner retinal layer opacification and thickening. There is persistence of the ILM detachment with multiple sub-ILM hyperreflective clumps. with middle retinal layer opacification being prominent. The inner retinal edema and neurosensory detachment have resolved and a normal foveal contour has been achieved. Fig. 4D: On day 41 post presentation of symptoms, there is extensive thinning of the inner retinal layers, with ILM separation and sub-ILM hyperreflective spots, necrosis of the retinal layers and tenting of the retinal layers due to ILM detachment